//flex布局复用
@mixin flex($hov:space-between,$col:center){
  display:flex;
  justify-content:$hov;
  align-items:$col;
}
// B背景图片复用
@mixin bgImg($w:0,$h:0,$img:'',$size:contain){
  display:inline-block;
  width:$w;
  height:$h;
  background:url($img) no-repeat center;
  background-size:$size;
}
@mixin position($pos:absolute, $top:0, $right:0, $w:100%, $h:100%) {
  position: $pos;
  top: $top;
  left: $right;
  width: $w;
  height: $h;
}
@mixin positionImg($pos:absolute,$w:0,$h:0,$top:0,$right:0,$img:''){
  position: $pos;
  top: $top;
  right: $right;
  width:$w;
  height:$h;
  background:url($img) no-repeat center;
  background-size:contain;
}